Examine source code of Comment Picker

{
  "name": "Comment Picker",
  "description": "Random Comments Picker for Giveaways and Contests.",
  "version": "2.0",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "https://*.instagram.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://localhost:8000/*",
        "https://comment-picker.com/*",
        "https://www.comment-picker.com/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3fc53844-b63d-4a8b-950e-16ab15d2a037}"
    }
  }
}